Adding and recording machine.



Patented Oct. 8, l90l. W. W. HOPKINS.

ADDING AND RECORDING MACHINE.

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ADDING AND RECORDING IACHINE.

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No. 683,939. Patented Oct. 8, I901. W. W. HOPKINS.

ADDING AND RECORDING MACHINE.

Application filed m 2, 1898.!

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No. 683,939. Patented Oct. 8, I901. w. w. HOPKINS.

ADDING AND RECORDING IAOIIINE.

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ADDING AND RECORDING IAUINIE.

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No. 683,939. Patented Oct. 8, I901.

W. W. HOPKINS.

ADDING AND RECORDING MACHINE.

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Witnesses I Pi gnvautot No. 683,939; Patented Oct. a, 190i. w. w. norms.ADDING AND RECORDING IACHINE.

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No. 683,939. Patented Oct. 8, IBM.

' W. W. HOPKINS.

ADDING AND RECORDING MAGl-HNE.

Appficntion filed m 2.169111 l4 Sheets-$heet l2.

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No. 683,939. Patented Oct. 8, IBM. W. W. HOPKINS.

ADDING AND RECORDING IACHINE.

Application filed Kay 2, 1898.) (Ito Model.) I4 Sheets-Sheet l3.

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No. 683,939. Patented Oct. 8, IQOI. W. W. HOPKINS.

ADDING AND RECORDING IAQHINE.

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UNITED STATES PATENT OFFICE.

\VILLIAM \V. HOPKINS, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE HOPKINSADDING MACHINE COMPANY, OF SAME PLACEL ADDING AND RECORDING MAcHiNs;

SPECIFICATION forming part of Letters Patent No. 633,939, dated October8, 1901.

Application filed May 2. 1898. Serial No. 679,494. (No modehi To allwhom it may concern.-

Be it known that I, WILLIAM W. HOPKINS, a citizen of the United States,residing at St. Louis, in the State of Missouri, have invented a certainnew and useful Adding and Recording Machine, of which the following issuch a full, clear, and exact description as will enable any one skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, forming part of thisspecification.

My invention relates more especially to that class of adding-machines inwhich a carriage or traveling member moves automatically from order toorder as the registering-keys are operated.

My invention is an improvement upon the adding-machine described inLetters Patent No. 517,383, granted to me March 27, 1894.

One object of my invention is to simplify the construction and reducethe number of parts of the adding-machine above referred to.

Another object of my invention is to provide means for positioning thecarriage in the left-hand or highest order of the number to beregistered preliminary to the registering of said number.

Another object of my invention is to print both the registered numbersand the sums from one set of printing-wheels, and thus dispense with thelaterally-moving paper-carriage set forth in my aforesaid patent.

Another object of my invention is to provide means for transferring thesum from the adding-Wheels to the printing-wheels.

Another object of my invention is to print all the digits of the numberto be registered or of the sum at one time and also to print directly bythe movement of the handle.

Another object of my invention is to provide against the over-rotationof the adding and printing wheels.

Another object of my invention is to provide means whereby the operatoris compelled to make a complete stroke of the handle, thus necessitatingthe complete performance of its work.

I will first set forth in a general way the plan of my machine and willthen describe the details thereof in full.

The machine is provided with a set of ten registering-keys correspondingto the digits 0 to 9, inclusive. These keys when depressed unlock amotor and so govern an escapement mechanism that the motor is permittedto rotate the registering-wheels exactl y proportional to the keydepressed. The machine is also provided with a set of orderkeys whichcorrespond in number to the number of orders in the registering capacityof the machine. When one of the order-keys is depressed, the carriage ismoved into position to actuate the registering-wheel of thecorresponding order. At the front of the machine is a series oftype-wheels which I will term printing-wheels. These wheels are looselymounted or journaled on a shaft which is preferably horizontal. Thenumber of these wheels determines the full capacity of the machine andis preferably one greater than the number of order-keys. To the rear ofthe adding-wheels areasetofidle wheels correspond ing in number to theprinting-wheels and also loosely journaled on a shaft which is parallelto the shaft on which the printing-wheels are journaled. Above the idlewheels are loosely journalell upon a shaft a corresponding number ofadding-wheels. These latter-mentioned wheels work in conjunction with acarrying mechanism and are adapted to be swung either into engagementwith the idle wheels or with the carrying mechanism. To the rear of theidle wheels is a shaft upon which is mounted a spur wheel which isadapted to engage successively with the various idle wheels.- This spurwheel is so mounted upon the shaft as to move longitudinally of it, butto be incapable of independent rotation. The axial movement of thisspur-wheel is governed by the carriage, which is controlled by theabove-mentioned order and registering keys. The shaft upon which thesaid spur-wheel is mounted has rigidly secured to its end a secondspur-wheel, which is rotated by a motor whose movement is controlled bythe registering-keys. It will be seen from this that when one of theorderkeys is depressed and the carriage brought into the desired orderthe laterally-moving spur-wheel will be brought in the same order andwill actuate the idle-wheel in that order, and thereby both the printingand adding ICO wheels of; said order,,as the adding-wheels ders arerotated they position the carrying mechanism for carrying in the variousorders, asrequired. When the handle is pulled, a

- number of printing-hammers corresponding to the number of orders inthe number registered are tripped to print the said number. Furthermovement of the handle brings the printed wheels to zero and at the sametime returns the carriage to its normal positionand also actuates thecarrying mechanism to carry in any of the orders in which it may havebeen positioned for carrying by the addingwheels, the adding-wheelsbeing thrown out of engagement with the idle wheels and into engagementwith the carrying mechanism during the first part of the motion of thehandle. After, each number is printed the paper is fed for the nextnumber, this motion being also preferably imparted by the move-.

ment of the handle.

When it is desired to take the sum of the numbers'registered, a key,which I term the total-key, is depressed to transfer the sum from theadding wheels to the printingwheels'. As this movement of theaddingwheels is in the opposite direction to their normalmovement, itwill be readily seen that thesum upon the adding-wheels will betransferred to the printing-wheels, as the said printing-wheels have thecharacters repeated upon them in ascending order from each side of thezero. printing-hammer-tripping device is moved to actuate the desirednumber of printing-hammers by means which I will not now describe.

The handle is pulled toward the operator as in-printing the registerednumber, and the printing-wheels are brought to zero in the same manner,except that they are moved in the opposite direction.

I do. not wish to be understood as limiting myself to the form andconstruct-ion'of machine shown and described, as many changes may bemade therein without departing from the spirit of my invention.

' In using the words printing-wheels and adding-wheels I do not wish tobe understood as limiting myself to wheels, as any mechanism which willprint, record, or indicate the numbers may be used in place of wheels.By the term carriage herein used I include any translating device whichis capable of establishing operative connection successively between thekeys and the recording or adding device.

.Myinvention consists in the combination, with an adding-machine of theclass referred to, of aset of keys for positioning the carriage When thesum is taken, the

at the left or highest order of the number to" be registered.

My invention also consists in the novel means for transferring the sumfrom the adding-wheels to the printing-wheels, whereby the necessity fortwo sets of type-wheels is dispensed with- My invention also consists inthe novel means for bringing the printing-hammer-tripping device intoposition to trip the desired number of hammers when the carriage ispositioned to register a number and also in the 7 means for positioningthe said printing-hammer-tripping device when the total-key is depressedto print the sum of the numbers registered. v y

My invention alsoconsistsin the means for locking the order-keys indepressed condition until the carriage has reachedits proper positionand also in the means for looking all the order-keys against movementafter one 'of the registering-keys has been struck until the handle isoperated to print the number registered. I v

My invention also consists in the novel.

means for preventing the return of the handle until it has performed itscomplete movement.

My invention also consists in other novel features. an d details ofconstruction, which. aretoo numerous to be set forth fully here, bultwhich'will be fully described in the specification, and pointed out inthe claims hereto af- In thedrawings, Figure l is aside elevationlooking at the left-hand sideo-f the machine, the case being shown insection. Fig. 2 is'a side elevation looking at the right-hand side ofthe machine. Fig. 3.isa front elevation. Fig. 4 is a detailed view' showing a part of the motor. other portion of the motor.

elevation. Fig. 7 is a rear view of, the carriage and a portion of theframe and also of some of the devices used to actuate the carriage. Fig.8 is an isometric projection of the device for unlocking the idle wheelswhen the registering-keys are depressed. Fig. 9 is a top plan view. Fig.10 is a vertical longitudinal section. Fig. 11 is a horizontal section.Fig. 12 is anelevation showing portions Fig. 5 is a detailed viewshowing an- Fig. 6 is a rearv of the-frame and the parts actuated by.the

movement of the total-key. Figs. 13 and Marc detailed views of some ofthe parts shown in Fig. 12. Figs. 15,16, and 17 are sectional viewsshowing the carrying mechanism in different positions. Fig. 18 is anisometric projection showing a portion of" the carrying mechanism. Fig.19 is an isometric projection showing the frame which carries theadding-wheels. tion of theshaft which actuates the frame shown in Fig.19. Fig. 21 is an isometric projection showing the comb for preventingthe overrotation of the wheels when being Fig. 20 is a secbrought tozero after the total is taken and the part actuating said comb. Fig. 22is a section through the total-wheels and the total-wheel shaft. Fig. 23is a longitudinal section showing a portion of the idle wheels. Fig. 24is an end view of one of the printingwheels. Fig. 25 is a section of oneof the printing-wheels. Fig. 26 is a rear view oftheprinting-hammer-trippingdevices. Figs. 27 and 28 are side and bottomviews, respectively, of details of the carriage. Figs. 29 and 30 areaside view and section, respectively, of the devices for preventing thepremature return of the handle. Figs. 31 and 32 are a side view andisometric projection, respectively, of one of the order-stop pawls.Figs. 33 and 34 are views showing a modification of the order-stoppawls. Fig. 35 is an isometric projection of the device forautomatically reversing the inking-ribbon. Fig. 36 is an isometricprojection showing a portion of the order and registering key bars. Fig.37 is an isometric projection showing the carriage. Fig. 38 is anisometric projection showing the printing-hammer-tripping device. Fig.39 is an isometric projection of a detail. Fig. 40 is an enlarged viewshowing the relative position of the printing-wheels, printing-hammers,and the paper and inkingribbon. Fig. 41 is an isometric projectionshowing the pawls for lockin g the idle wheels. Fig. 42 is an isometricprojection showing details of construction of the devices for lockingthe order-keys. Fig. 43 is a side view showing the devices for actuatingthe paperfeeding rollers. Fig. 44 is a side elevation of aportion of themachine. Fig. 45 is a view showing a modification of the device forunlocking the idle Wheels. Fig. 46 is an enlarged view of a portion ofFig. 10. Fig. 47, Sheet 9, is a view showing in detail some of thedevices shown in Fig. 12; and Fig. 48, Sheet 11, is an enlargedcross-section on the line 48 48 of Fig. 26.

The frame of the mac7tine.-At the forward end of the machine are twoside frames 40 and 41, and at the rear are two standards 42 and 43, towhich is attached one end of the frame 44, the other end of which isattached to two uprights 45 and 46. 47 is a standard to which isattached the motorcasing 48. The side frames 40 and 41 and the standards42, 43, 45, 46, and 47 are secured to a base 49. Swung within the frame44 is a frame 50. (Shown in detail in Fig. 19.) While I prefer to usethe form of frame shown, I do not limit myself to the same, as manyforms of frames may be designed which will answer the same purpose.

The printing and idle iu7ieeZs.-The printing-wheels are preferably onemore in number than the order-keys of the machine, so as to allow theprinting of a sum which has one more order than any number which can beregistered in the machine; but they may be any greater number. Theprinting-wheels 51 are composed of a spur-wheel and an attachedprinting-disk, Fig. 25. The said printing-disk may be composed of anumber of sectors, each of which carries one printing character. Theseparate parts of the wheel 51 are held in place by means of a hub 52and washer 53. The said printing-wheels 51 are loosely jonrnaled on ashaft 54. The printing characters of the Wheel 51 are arranged inregular order from 1 to 9, inclusive, at each side of the O. The 0normally stands at the front of the wheel in such a position as to bestruck by the printing-hammers. Meshing with the spur-wheels 51 are aseries of idle wheels 55, Figs. 10 and 46, which are loosely mounted ona shaft 56. Between each two of the spur-wheels 55 is a split washer 57,Figs. 10 and 25. Secured in the shaft 56 is a comb 58, the teeth ofwhich project between the spur-wheels 55 and are adapted to come incontact with pins 59,which project from the left side of each of thespurwheels 55. When the shaft 56 is rotated the proper distance, thecomb 58 by coming in contact with the pins 59 brings the wheels 55 intotheir normal position, thus positioning the printing-wheels 51 withwhich the said idle wheels 55 are in engagement. The shafts 54 and 56are journaled in the uprights 45 and 46. At the rear of the shaft 56 isa shaft 60, Figs. 7, 10, and 46, which is journaled inrearwardly-extending arms 61, carried by the uprights 45 and 46. Rigidlysecured to the shaft 60 is a spur-wheel 65, which is adapted to beactuated by the motor, to be hereinafter described. Mounted on the shaft60 is a collar 66, which is provided with a spline or feather 67, whichruns in a groove 68 in the said shaft 60. This allows thesaid collar 66to move freely in the direction of the length of the shaft 60, butprevents it rotating independently of said shaft. Secured to the collar66 is a spur-wheel 69, which is adapted to mesh successively with thevarious idle wheels 55 as it is moved along the shaft 60 by thecarriage, which is to be hereinafter described.

Adding-wheels.Journaled in the frame 50 is a shaft 72, Figs. 10, 15, 16,17, and 46, upon which are loosely mounted anumber of spurwheels 73,which correspond in number to the idle wheels 58 and normally engagedtherewith. Between each two wheels 73 and around the shaft 72 is a splitwasher 74. Carried in the shaft 72 is a movable comb 75, which isactuated by pressure upon the end of an extension 76. Upon each of thewheels 73 at diametrically opposite points are teeth 77, Figs. 22 and46, which are cut away at their inner ends, so that the comb 75 does notnormally strike them, said comb being normally kept in a right-handposition by a spring 78.

IIO

llfoior and gearing.-8l, Fig. 1l,is the motor-spring, one end of whichis attached to the motor-casing 48 and the other to the motor-shaft 82.Rigidly secured to the motorshaft 82 is a ratchet-wheel 83. (Shown indetail in Fig. 4.) Loosely mounted on the motor-shaft 82 is a spur-wheel84, on which is carried a dog 85, which is kept in engage inent with theratchet-wheel '83 by means of a 2 spring 93, Figs. 5 and 11, one endof-which is attached to thesaid cover 92'and the other to the flange ofa pulley 94, which is loosely journaled on the motor-shaft 82. Rigidlysecured to the motor-shaft 82 is a disk' 95, (bestshown in Fig. 5,)which is provided with a projection 96, which is adapted to strikeagainst a pin 97, by which the spring 93 is secured to the pulley 94.Secured to the pulley 94 and passing around the same is one end of 'achain 98, Fig.2, the other end of which is secured to an arm 99, whichis actuated by the handle 100. g

The registering-kegs and mechanism for controlling themotor-escapement-105 represents the registering-keys, Figs..9 and 11,which are numbered from .1 to 9, in'clu-' sive, beginning at the left.The zero-registering key for convenience is placed at the right. 106,Figs. 10 and 11, represents the registering-key bars, which are pivotedon a shaft 107. The registering-key bars vary in length, as best shownin Fig. 11. Secured to the rear uprights 42 and 43 are arms 108, Figs. 1and 10, to which is pivoted a frame 109. Secured in the frame 109 isarod 110,

which passes over and rests uponallthe regis- 'teringkey bars except thezero key bar.

Sliding on the frame 109 is a rack 111, Figs.

1, 10, and 46, by which is carried-a stop 112, which is adapted to comein contact with the ends of the bars 106. Carried on the frame 109 is adog 113, which engages with the ratchet-wheel 89 and prevents the saidratchetwheel, and thereby the motor, from rotating. The bars 106 areheld in their normal position by springs 114. Carried by the rack 111 isa downward extension 115, to which is attached one end of a'spring 1'16,Figs. 1, 2, 19, and 46, the other end of. which is attached to adownward'extension 117 of the frame 109. The object of this springis toreturn the rack 111 to its normal position afterit has become disengagedfrom the spur-Wheel 90.

The carrying mecham'Sm.--Secured in the frame 44 are a number ofcarrying-bars 118, 'Figs. 6, 9, 10, 15 to 18, and 46, corresponding tothe number of adding-wheels 73 in the machine. Each of these barsexcept'that at the right hand is adapted to slide longitudinally a shortdistance. Extending downwardly from each of the bars 118 except that atthe right hand is an arm 119, and each of the bars is provided withteeth 120, preferably three innumber, which are adapted'to be engaged%by the adding-wheels when the said wheels are raised. Pivoted to each ofthe bars 118:

at its left-hand side is a pawl 121, having a downward projection 122 atits forward end. Pivoted on the shaft 123 in the frame 44 are pawls 124,corresponding in number to the bars 118 and engaging with them, as isbest shown in Figs. 15 to 18. Between each of the pawls 124 and the arm119 of the correspond ing carrying-bar is stretched a coil-spring 125.In each of the pawls 124 is a pin 126, upon which rests the end of thepawl 121, which is pivoted to the next carrying-bar to the right, andineach of the carrying-bars is a pin 127, which limits the upwardmovement of the pawl 121, which is pivoted to it.

JlIeans for raising the adding'wheels to put them tnengagement with thecarrying-bars.. The frame 50, (see also Fig. 19,) in which the shaft 72of the adding-wheels 73 is journaled, is pivoted in the frame 44 at thepoint 136, Figs. 10, 15-, and 46. journaled in the frame 44 is a shaft131, which is provided with a blade 132, which is adapted to come incontact with the arms 119 of the carrying-bar 118, and thus move thesaid carrying-bars to their normal position. The shaft 131 at the pointat which the frame 50 rests upon it has a cross-section, as shown inFig. 20, from which it will be obvious that when the shaft 131 isrotated the frame .50 will be swungupward on its pivot 130. In the frame50 is a pin 133, which engages with ahook 134 on the shaft 131 when thesaid shaft is in its normal position, and thus prevents the frame 50from being accidentally swung on its pivot. V

The carriage and actuating mechanism.- In the rear of the frames 40 and41 is secured a guide 137, Figs. 1, 7, 10, and 46, upon which thecarriage runs. The carriage-is composed of a rear plate 138 and afront'plate 139, between Which are secured grooved wheels 1 40, whichrun on said guide 137. To the rear plate 138 is secured a ratchet-bar141,-Fig. 7. At the right-hand end of the ratchet-bar 141 is a pin 142.Depending from the plate 138 is a stop 143, Fig. 36, having a lateralprojection 144. The stop 143'is adapted to come in contact with theorder-key bars, hereinafter to be described. Pivoted to the-guide 137 isa dog 145, which engages with the ratchetbar 141, as best shown in Fig.7. Pivoted to the lower and rear part of the upright 45 is a T-shapedlever 146, to which is pivoted adog 147, which alsoen gages with therack-bar 141. Pivoted to the lower and rear'end ofthe-upright 46 is anL-shaped lever 148, which carries a pin 149, extending under the dogs145 and 147 and adapted to raise the said dogs. Carried by the T-shapedlever 146 is a stop 150, which is adapted to come in contact with thepin 142, carried by the rack-bar141, and thus lock the said lever 146against movement when the carriage is in its normal-position.

Below the frame 50 and Extending upwardly from the rear plat-c 138 is anarm 151, having at its'upperend-a U- Tshaped portion 152, which-takesinto a groove upon the collar 66, and thus moves t-hesaid collar 66 andattached wheel 69 longitudinally on the shaft 60.

153, Figs. 1, 9, and 11, represents the orderkeys, which are numberedfrom one to nine, inclusive, from right to left; 154, the orderkey bars,which pass between the registeringkey bars and are pivoted on the sameshaft 107. Pivoted on the shaft 107 at the sides of the registering andorder key bars are arms and 156. Carried by the arms 155 and 156 is arod 157, which is adapted to be raised when the order-keys are struck bythe movement of their bars. An extension of the arm 155, Figs. 1 and 11,engages with the L-shaped lever 148, Fig. 7, and thus raises the dogs145 and 147. Extending rearwardlyfrom thelever 146 is a pin orprojection 158, which rests upon the rod 110 of the frame 109. Pivotedin the uprights 45 and 46 above the orderkey bars 154 is a catch 159,Figs. 10, 11, 39, and 46, which is adapted to come into engagement withoffsets in the rear of the upward extensions of the order-key bars 154.Secured to the rear plate 138 of the carriage is a projecting plate 160,Figs. 10, 25, 28, and 46, provided with a downwardly-extending pin 161,which is adapted to comein contact with the upward extensions of theorder-key bars 154. The catch 159 is held in its normal position by aspring 162, which is secured to said catch and a rod 163, extendingbetween the uprights 45 and 46. Secured to one arm of the T-sha-pedlever 14-6 is aspring 164, Fig. 7, the other end of which is secured atthe right hand of the machine, either to the side frame 43 or to thebase. The object of this spring 164 is to move the lever 146 to itsnormal position after it has been swung on its pivot by the movement ofthe bars 106, and thus feed the carriage one space toward the right.

ilfeans for locking the order-heys.-Pivoted to the lower and rear end ofthe upright 45 is an arm 165, Figs. 1, 6, 11, and 12, having aprojection 166, Fig. 42, adapted to take over the top of the lever 148.In the rear of the arm 165 is a depression adapted to receive a pin 167,carried by the frame 109. On the shaft 169, journalcd in rearwardextensions of the uprights 45 and 46, is a cam 170, Fig. 42, adapted tomake contact with the upper end of the arm 165 when the said shaft 169is rotated.

flfcans for unlocking the printing and adding wheeZs.-On a shaft 172,secured in the uprights 45 and 46, are pivoted a number of pawls 173,corresponding in number to the number of idle wheels 58. The pawls 173are held in position to lock the idle wheels 58 by springs 174, one endof which is secured to the downward extensions 175 of said pawls 173 andatthe otherend to other-pawls, which will be hereinafter described.Carried by the rear plate 138 of the carriage is a block 176, (shown indetail in Fig. 8,) in which is pivoted a bell-crank lever 177. To thelower end of the bell-crank lever 177 is secured a gage the said pawls173 from the idle wheels 58. In Fig. 45 is shown a modification in whichthe block 176, the bell-crank lever 177, and arm 180 are replaced by alever 182, which is pivoted to a stop to be hereinafter described, whichis secured to the front plate 139 of the carriage. The lever 182 has anextension 183, which rests on a bar 179, hereinbefore described.

The printing hammers-Carried in forwardly-extending brackets carried bythe up rights 45 and 46 is a shaft 183, on which are pivoted theprinting-hammers 184, Figs. 3, 10, and 46 which are adapted to come incontact with the printing-faces of the printing or type wheels 51.represents springs, one end of which is attached to the saidprintinghammers 184 and the other to a rod 186, socured in the frames 40and 41. The point of attachment of the springs 185 to the hammers 184 ison line with the shaft 183 and the rod 186, so that any movement of thehammers in either direction is resisted by the springs.

The printing-hairliner-tripping dcrices.- Pivoted at one end of theforward extension of the upright 45 and atthe other to the frame 41 is aratchet-bar 188, upon which slides a sleeve 189.(ShownindetailinFig.26.) In the left-hand end of the sleeve 189 ispivoted a dog 190, which is adapted to engage with the teeth on therack-bar 188. The said dog 190 is constructed so as to allow the sleeve189 to move freely toward the left, but to prevent its movement towardthe right, except when the said dog is moved out of contact with therack-bar by contact with a rod 191. At the right end of the sleeve ispivoted a dog 192,

which is arranged so as not to interfere with the movement of the sleeve189 toward the right, but to prevent its movement toward the left,except when the pressure of an arm 193, attached to the carriage, raisesthe said dog 192 out of contact with the rack-bar bypressure on adownward extension 194 of the said dog. Secured in the rear of the sleeve189 is a blade 195, which is adapted to make contact withforwardly-projecting fingers 196 of the printing-hammers 184. The bladeprojects through the sleeve 189 into a groove 197in the bar 188, andthus prevents the said sleeve 189 from rotating independently of thesaid bar 188. 198 is an extension of the blade 195, to which is attachedone end of a spring 199, the other end of which is attached to an arm onthe bar 188.

Devices for positioning the printing-hammer-tripping device when takingthe fetch- Carried by the uprights 45 and 46 is a shaft 200, upon whichare pivoted a number of tion by contact with a notch in a flange 204pawls, which I term order-stop pawls, corresponding in number to thenumber of printing-wheels. To each of the order-stop pawls 201 ispivoted a dog 203, which prevents the rotation of the pawl 201 in aforward direcon the said shaft 206. Each of the dogs 203 is providedwith a rearward extension 205, which is adapted to come in contact withthe downward extensions 175 of the pawls 173. Extending from each of thepawls 201 at its right-hand side is a pin 206, which is adapted to makecontact with the dog 203 of the pawl to the right when it is released.Extending from the front plate 138 of the carriage is a step 208, whichis adapted to make contact with the pawls 201 when they are thrownrearwardly by mechanism to be hereinafter described. Secured inthenprights 45 and 46 is a rod 209, which limits the forward movement ofthe pawls 201. The pawls 201 are held in their normal position bysprings 210, which are attached at one end to the said pawls and at theother to the rod 163. In a modification shown in Figs. 33 and 34 the dog203 is replaced by a dog 202, having an upward projection 211, which isadapted to come into contact with the teeth of theprinting-wheels 51.

Mechanism for bringing the printingwheels to zer0.In the left-hand endof the idle-wheel shaft 56 is a spur-wheel 212. (Best shown in Figs. 1and 12.) Pivoted to the frame 40 is an arm 213, carrying a toothedsegment 214, which engages with the spurwheel 212. 215 isan arm whichrides over the shaft 107, as best shown in Fig. 12, so as to allow bothan upward-and-downward and lateral motion. In the upper end of the arm215 is an opening 216, through which extendsthe pivot 217 of the arm213, the said pivot 217 being provided with a head 218, which preventsthe arm 215 from being displaced. To the rear of the pivot 217 is a pin220, secured in the arm 213. This pin 220 is normally in engagement witha recess 221 in the upper end of the arm 215. Secured to the shaft 107is an arm 222, towhich is pivoted one end of a link 223, the other endof which is attached to the arm 215 by a screw 224,

,Which passes through a slot 225 in the said arm 215. At the front ofthe pivot 217 is secured in the arm 213 a pin 226, adapted to be broughtinto engagement with a recess 227 in the upper part of the arm 215 whenthe said arm 215 is moved forward. The arm 215 is held in its normalposition by a spring 228, Fig. 1, one end of which is attached to theupper end of said arm and the other to the frame 40.

llfeans for bringing the ,adding wheels to zera-On the left-hand end ofthe adding- Wheel shaft 72 is secured a spur-wheel 230, Fig. 14, throughwhich projects the rounded end of the projection 76,"hereinbeforedescribed. Journaled on the shaft 131 is an arm 232, provided with atoothed segment 233, which engages with the spur-wheel 230. On the arm232 is a pin 234, which works in an L-shaped slot 235 in a lever 236,which I term the total lever or key. The lever 236 is pivoted at itsrear end to the frame 44 and is provided at its front end with a key237. On the lever 236 is a downward extension 238. (Best shown in Fig.14.) The downward extension 238 has its lower end beveled, as shown inFig. 22, and is adapted to force the projection 76 of the comb 75inwardly.

llfeans for reversing the mechanism for bringing the printing-wheels toeer0.Pivoted to the arm 236 is a plate 240, Figs. 12 and 13, in which isan opening 241, through which extends a pin 242 in an arm 243, which ispivoted on the idle-wheel shaft 56. Formed integral with the arm 243 isan arm 244, which is connected to a link 245 by means of a screw 246,which passes through a slot 247 in the said link. Pivoted to an upwardextension of the frame 45 is a hook 248, which is adapted to engage witha pin 249 on the link 245, and thus hold the arm 215 in its forwardposition. The hook 248 is pulled downwardly by a spring 251, Fig. 1,which is attached at one end to the said hook and at the other to theframe 40. The downward movement of the hook 248 is limited by means of astop 252, which works in a curved slot 253 in the said hook. 7

Means for aczfnaiin g the ordenstop pawls. In the plate 240 is avertical slot 255, having a rearward and downward incline portion 256,which works on a pin 257. 259 is a link which is connected to the plate240 by a pin 260 passing through-the extension 256 of the slot 255 andinto the arm 258, which is pivoted on the upright 45 by the pin 257,which also passes through the slot 255. The other end of the link 259 ispivoted to an arm 261, which is rigidly secured to the shaft 200 of theorder-stop pawls.

Jlleans for preven ing overrotaiion of the idle wheels on resetting t0zer0.-Journaled in rearward extensions of the frames 45 and 46 is ashaft 264, Fig. 46, upon which are pivoted a number of pawls 265, equalin number to the idle wheels 58. The ends of the pawls 265 are slightlyto the rear and below the pins 59 of the idle wheels 58 when the saididle wheels are in their normal position. On the pawls 265 are downwardprojections 266, to each of which is attached one end of one of thesprings 174, the other end of which is attached to one of the pawls 173,as previously described. On the shaft 169 is a blade 267, which comes incontact with the inclined edges of the downward extensions 266 of thepawls 265, and thus holds the said pawls in their normal position.

Pivoted on the shaft 54 of the printingwhecls 51 are two arms 272 and273, Fig. 21. Connecting the ends of the arms 272 and 273 is acomb 274,the teeth of which stand slightly to the front and below the pins 59 ofthe idle wheels 58. Pivoted on the left-hand end of

